The hotfix I pointed you too just restores the jb without any downgrade. I'm still on 5.6.1.1 and everything works as expected.
The only requirement is that the jb you had before the upgrade to 5.6.1.1 was not to old for that way to work. You can give it a try, that only risk (as far as I know) is that the jb will not be restored.
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